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    <title>Document</title>
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    <script>
      let setArr = [1, 2, 3]
      function handleData(arr, yes = true) {
        // 判断是否接收成功
        // console.log(arr)
        let sum = 0
        for (let i = 0; i < arr.length; i++) {
          sum += arr[i]
        }
        
        if (yes) {
          console.log(sum)
        } else {
          console.log(sum / arr.length)
        }
      }
      handleData(setArr, false)
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